Equal operator attempting to reference a deleted function, array - c++

Question

I am using SFML to create a space invaders clone with C++. I am quite new to C++ and I'm learning it as I'm working on this project.
I am getting the following error when trying to create a new enemy using the constructor and array to set settings for each created enemy:
1>enemy.cpp
1>C:\Users\dzamm\source\repos\SFML\enemy.cpp(35,1): error C2280: 'Enemy &Enemy::operator =(const Enemy &)': attempting to reference a deleted function
1>C:\Users\dzamm\source\repos\SFML\enemy.h(55): message : compiler has generated 'Enemy::operator =' here
1>C:\Users\dzamm\source\repos\SFML\enemy.h(55,1): message : 'Enemy &Enemy::operator =(const Enemy &)': function was implicitly deleted because a data member invokes a deleted or inaccessible function 'sf::RenderWindow &sf::RenderWindow::operator =(const sf::RenderWindow &)'
Enemy Constructor:
Enemy alienArray[NUMBER_OF_ALIENS];
//constructor sets ID number, loads sprite
Enemy::Enemy(const int id, float sp)
{
//set alive
mIsAlive = true;
//set speed
enemySpeed = sp;
// Load an enemy texture
if (!mEnemyTexture.loadFromFile("Media/Textures/PixelSpaceships/red_01.png")) {
// Handle loading error
std::cout << "Oh No! File not loaded." << std::endl;
}
//scale sprite and set texture so we know size
enemySprite.setTexture(mEnemyTexture);
}
Enemy loader method
void Enemy::loader(int noOfAliens) { // might add xPosition;yPosition
for (int i = 0; i < noOfAliens; i++)
{
Enemy alien(i, 10.f); // speed issue
alien.setLocation(i * 100.f + 50.f, alien.getSprite().getGlobalBounds().height / 2);
line 35 alienArray[i] = alien;
//alienArray.push_back(alien);
}
}
1>C:\Users\dzamm\source\repos\SFML\enemy.cpp(35,1): error C2280: 'Enemy &Enemy::operator =(const Enemy &)': attempting to reference a deleted function
Enemy Header file:
#include <SFML/System.hpp>
#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
#include <SFML/Network.hpp>
#pragma once
#define NUMBER_OF_ALIENS 4
//class Game;
class Enemy
{
public:
//constructor sets ID number, loads sprite
Enemy() {};
Enemy(const int, float);
sf::Sprite& getSprite();
void kill();
bool isAlive();
void load();
void loader(const int noOfAliens);
void setLocation(float xPosition, float yPosition);
void enemyInstantiator(int noOfEnemies, float xPosition, float yPosition);
void update();
void render(sf::RenderWindow& window);
private:
void enemyBehaviour(std::vector<sf::Sprite>& enemyList);
void enemyMovement(std::vector<Enemy>& enemyList);
private:
sf::Texture mEnemyTexture;
sf::Sprite enemySprite;
//std::vector<Enemy> alienArray;
//std::vector<sf::Sprite> mEnemies;
sf::RectangleShape mEnemyBounds;
sf::RenderWindow mWindow;
bool mIsShooting;
bool mIsAlive;
float enemySpeed;
};
I read on forums that issue is related to working with a copy of the object instead of the original object, however I am not sure how to handle this to reference the original object I'm modifying.
To reproduce create a constructor for Enemy.cpp class, create an entity Enemy alien using for loop in method as shown in Enemy::loader and store the created entity in the Enemy alienArray as shown by index.

Answer 1

The issue was related to an sf::RenderWindow reference that was not being even utilised in the code.
sf::RenderWindow &sf::RenderWindow::operator =(const sf::RenderWindow &)
Once I removed this all errors disappeared.